Electric Toothbrush Brush Head Coupling for Low-Wear Quiet Assembly

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Solution Overview

Problem

Conventional electric grooming and cleaning brushes, such as electric toothbrushes, have brush heads composed of many individual parts, leading to increased wear and tear, high manufacturing costs, and noise during operation, while also being difficult to assemble and maintain.

Innovation Solution

A multi-part brush head assembly with a brush head housing, drive rod, and locking element, featuring a drive gear system that converts oscillating rotary motion into an oscillating movement, with a control pin for secure attachment and reduced wear, allowing for easy assembly and low energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the brush head is composed of many individual parts, then the functionality and adaptability are improved, but the device complexity and manufacturing costs increase

Engineering Contradiction:

Improvebrush head functionalityVSAvoidnumber of parts

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The brush head is divided into modular components (brush head proper, drive rod, locking element) that can be independently manufactured and assembled. This segmentation allows for optimized functionality of each part while maintaining overall system adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The coupling mechanism is designed with universal features that allow the same basic structure to serve multiple functions: mechanical coupling, rotational constraint, and drive transmission. This reduces the need for separate specialized components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the brush head is composed of many individual parts, then the adaptability is improved, but the ease of manufacture decreases

Engineering Contradiction:

Improvebrush head functionalityVSAvoidassembly difficulty

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The locking element is pre-formed with integrated features (such as pre-formed engagement protrusions and recesses) that enable quick assembly without requiring complex alignment procedures or additional fastening steps during assembly.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Multiple functions are merged into single components: the locking element simultaneously provides mechanical coupling, rotational constraint, and drive transmission. This reduces the total number of assembly steps while maintaining functionality.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If conventional coupling mechanisms are used, then the brush head can be attached to the handle, but wear and noise increase during operation

Engineering Contradiction:

Improvecoupling securityVSAvoidwear and noise

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent replaces traditional friction-based mechanical coupling with a positive engagement system using interlocking geometric features. This substitution eliminates sliding friction and associated wear while reducing operational noise.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The drive rod serves as an intermediary element between the handle coupling and the brush head oscillation mechanism. It transmits motion while being isolated from direct frictional contact, thereby reducing wear and noise in the coupling interface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4438005B1Electric body care brush

Publication Date: 2026.03.11 TRISA HLDG AG

Figure 1a~1c
Figure 2a~2g
Figure 3a~3e

AI summary

The invention relates to a brush attachment (2) for an electric body care brush, in particular an electric toothbrush, comprising a brush head (61) with a bristle carrier (62), in particular a circular one, on which a bristle field with a plurality of bristle bundles (81, 82) each with a plurality of care bristles is arranged.